I was in a similar situation on my 71 1600 and contacted NHS in 2009 for help. Getting this response below, I simply found a used one on the FAQ instead. My used clock runs great, but calibrating the time is a real pain--I ran it for weeks on my bench and got it to keep time, but once installed in the car, it seems to run fast. If you have the coin, the quartz movement is probably ultra nice.
Dear Ben,
Due to age and usually worn out conditions we no longer repair electro mechanical clock movements as used in your BMW 1600 clock but do offer a quartz movement conversion at $ 220.00 plus shipping. The conversion does not alter the appearance of the clock and provides you with a superior product.
1 year warranty. App. 1 week turnaround time.
We do accept Visa, M/C, UPS COD CASH, or Pay Pal
Our shipping address:
North Hollywood Speedometer
6111 Lankershim Blvd.
North Hollywood, CA 91606
Ph: 818-761-5136
Regards,
Hartmut Behrens
info@nhspeedometer.com